/* 设计原理页 · 悠悠江湖（T443：绿色公益养老主题） */

.design-intro { padding: 22px 24px; margin-bottom: 18px; }
.design-intro h2 {
  font-family: "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 23px; letter-spacing: 2px; color: var(--brand); margin: 0 0 8px;
}
.design-intro .design-lead { margin: 0 0 16px; color: var(--ink-2); font-size: 15.5px; line-height: 1.85; }

.design-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.design-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 12px 15px;
}
.design-card strong { display: block; color: var(--brand); font-size: 14px; letter-spacing: .5px; margin-bottom: 3px; }
.design-card span { display: block; color: var(--ink-2); font-size: 13.5px; line-height: 1.8; }

.design-prose { margin-top: 0; }
.design-prose h2 {
  font-family: "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 21px; letter-spacing: 1.5px; color: var(--brand);
  margin: 22px 0 8px; padding-bottom: 6px; border-bottom: 1px dashed var(--line);
}
.design-prose h2:first-child { margin-top: 0; }
.design-prose p { margin: 0 0 10px; }
.design-prose ul { margin: 0 0 12px; padding-left: 20px; }
.design-prose li { list-style: disc; margin: 4px 0; color: var(--ink-2); }
.design-prose code { font-family: Consolas, monospace; font-size: 12px; color: var(--ink-2); }

.design-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.design-links .btn { padding: 9px 18px; font-size: 15px; font-weight: 600; letter-spacing: 0; box-shadow: none; }

@media (max-width: 720px) {
  .design-intro { padding: 16px; }
  .design-grid { grid-template-columns: 1fr; }
  .design-prose h2 { font-size: 19px; }
}